Tactical Server

 Play as Guest or Register and Login. You will have 36.000+ tactical problems to solve.  

Susan Polgar

It’s a great site that focuses almost exclusively on tactics with a tight community constantly competing to make it to the top of the rating system.
The site is very bare bones making it ideal for people on a slow connection or accessing the internet from a mobile.
I recommend this place for intermediate and advanced chess players who want to brush up on tactics without hurting their hard earned high ratings.”